Preparation Of New Guanidine Ionic Liquids And N-heterocyclic Carbene Gold Catalyst And Their Applications In Conversion Of Carbon Dioxide

Carbon dioxide is abundant,clean,cheap,non-toxic and recyclable carbon resource.The transformation of carbon dioxide into high value-added chemical products provided cheap and available raw materials for the chemical industry,and alleviated increasingly serious environmental problems.Carbon dioxide is thermodynamically stable and kinetically inert,and its chemical conversion,especially under mild conditions,was challenging.Therefore,it was practical significance to develop a highly active catalytic system for the chemical transformation of carbon dioxide.Based on these,we developed three kinds of efficient catalysts and used for the conversion of carbon dioxide.The detailed contents were as follows:1.A series of novel ester substituted tetramethylguanidine ionic liquids were prepared by ionized reaction of tetramethylguanidine with?-bromoesters.The catalyst showed excellent catalytic activity in reaction of carbon dioxide and N-methylaniline.With the adjustment of alkyl chain length,N,N-dimethylanilline and N-methylformanilide products can be selectively formed,and the activity of the catalyst had not decreased significantly after five cycles.2.Tetramethyl guanidine ionic liquid containing three different anions of chloride ion?Cl^—?,acetate ion?OAc^—?and lactic ion?Lac^—?were synthesized by two-step method using tetramethylguanidine as a feedstock,and then there were cross-linked with divinylbenzene?DVB?to synthesize porous organic polymers with three different anions.The catalytic materials characterized by BET,¹³C NMR,SEM,TGA and other testing techniques.The catalytic material showed excellent catalytic activity in the cycloaddition reaction of carbon dioxide with propylene oxide,and it could be reused at least five times without losing activity.3.N-heterocyclic carbene gold functionalized porous organic polymers had been successfully prepared based on 1,3-bisbenzylimidazol gold as fundamental building blocks through the Friedel–Crafts alkylation reaction.The catalytic material characterized by SEM,BET,TGA,ICP,XPS and other testing techniques.The catalytic material could efficiently catalyzed the cyclization of CO₂ with propargyl amine under mild conditions and it could be reused at least five times without losing activity.